Norton Abrasives C6136 User Manual

Page 51

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51

label). On the "inline" style relief valve the return lines,
threaded into the back, will have to be removed in order to
reach the adjusting screw. The "internal" relief valve is
adjusted with a screw driver and the "inline" relief is
adjusted with a 1/4" alien key.

B. Relief Valve Pressure Too Low:

1. Symptoms:

Motor RPM is faster than normal.

Cylinder will not extend.

Excessive turbulence in the reservoir.
NOTE: On applications where the cylinder is being
replaced or the mechanical mechanism is being
modified, make sure the pressure capability of the
pump is not being exceeded.


13. Diagnosing and Repairing Hydraulic Pump Relief Valves:

A. Two possible causes for lack of pressure

The adjusting screw has backed up.

Foreign matter or "dirt' is trapped between the seat and
the ball or cone.

B. Repair as follows:

Using a gauge tee'd into the pressure line, turn the
adjusting screw clockwise a turn or two and watch the
gauge; if it goes up, continue to turn the screw until the
required setting is reached. If the screw does not
remain in the correct position, replace it with one that
has a locking patch (In an emergency the screw
threads can be deformed slightly with a small prick
punch and hammer to hold the setting.)

If the pressure does not climb when the adjusting screw
is tightened; turn the adjusting screw counterclockwise
all the way out: energize the pump to 'flush' the dirt past
the seat:

CAUTION: use hand or a piece of hose to
divert oil into a container. Do not look into
the port.)

NOTE: In an emergency, if a pressure

gauge is not available, turn the relief valve screw in until the
cylinder moves under worst conditions and then tighten 1/2 to
3/4 additional turns.

C. If the above mentioned procedure fails to increase the relief

valve setting, check for a worn pump or leaking cylinder


14. Troubleshooting and Repairing Hydraulic Pump Relief Valves

A. Load drift failure

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